PDO Specific module can't be found

Hello,

I am trying to install the PDO_SQLDRV, and when i run php --ini I get "the specified module can not be found" for these two files: php_pdo_sqlsrv_71_nts_x64.dll & php_sqlsrv_71_nts_x64.dll.  I found these files from the SQLSRV43 download, which automatically extracted dll's to this file path (C:\wamp\bin\php\php7.1.9\ext).  In PHP.ini this is the extension_dir.

In the Dynamic Extensions section, I put this in

extension=php_sqlsrv_71_nts_x64.dll 
extension=php_pdo_sqlsrv_71_nts_x64.dll